IAB Node Reconfiguration Delay for Faster Wireless Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The sequential exchange of reconfiguration messages and security handshake procedures in wireless communication systems, particularly in integrated access and backhaul networks, leads to increased handover delays.
Innovation Solution
Implementing a mechanism for delayed reconfiguration by allowing intermediate IAB nodes to postpone applying reconfiguration messages until a secondary signaling path becomes available, enabling parallel execution of acknowledgement and security handshake procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reconfiguration messages are exchanged sequentially in integrated access and backhaul networks, then signaling path reconfiguration can be completed, but handover delays increase
Solution Approach 1:
The system performs preliminary actions by establishing the secondary signaling path and preparing reconfiguration messages in advance before the handover is actually needed. The IAB donor node configures the alternative path ahead of time, so that when handover becomes necessary, the reconfiguration can be applied immediately without sequential delays, thus reducing handover time while ensuring reliable path reconfiguration
Solution Approach 2:
The system dynamically switches between primary and secondary signaling paths based on handover requirements. The IAB node can dynamically apply or postpone reconfiguration messages depending on the availability of the secondary path and the current handover state, allowing flexible adaptation that reduces delays while maintaining reliable reconfiguration completion
2Productivity
If intermediate IAB nodes apply reconfiguration messages immediately, then path reconfiguration is completed faster, but parallel processing of acknowledgements and security handshakes is prevented
Solution Approach 1:
The IAB node performs preliminary setup of the secondary signaling path and prepares to receive reconfiguration messages before they are actually sent. This preliminary preparation enables the node to immediately process reconfiguration messages and their associated acknowledgements and security handshakes in parallel once received, increasing productivity without overwhelming the device complexity
Solution Approach 2:
The reconfiguration process is segmented into independent components: the reconfiguration message itself, the acknowledgement transmission, and the security handshake procedure. By segmenting these operations, the IAB node can process them in parallel rather than sequentially, achieving faster reconfiguration completion while managing device complexity through modular processing of each segment
3Productivity
If reconfiguration messages are postponed until secondary signaling path is available, then parallel processing is enabled, but reconfiguration application time increases
Solution Approach 1:
The system performs preliminary establishment of the secondary signaling path in advance, so that when reconfiguration messages arrive, the path is already ready for immediate parallel processing. This preliminary preparation reduces the actual reconfiguration application time while maintaining the ability to process acknowledgements and security handshakes in parallel
Solution Approach 2:
The system dynamically adjusts the timing of reconfiguration message application based on the availability of the secondary signaling path. Rather than rigidly postponing or immediately applying reconfiguration, the system flexibly times the application to coincide with path availability, enabling parallel processing without excessive delays in reconfiguration completion
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods, systems, and devices for wireless communications are described that support delaying the application of reconfiguration messages. An integrated access and backhaul (IAB) node transmit or receive, along a first signaling path, a reconfiguration message indicating the first IAB node to postpone applying a reconfiguration message until a second signaling path becomes available. The first IAB node may send a reconfiguration complete message to a first IAB donor node along the first path and wait to perform a procedure with the first IAB donor node. When the second path becomes available, the first IAB node and the second IAB node may then perform the procedure. In some cases, delaying the reconfiguration may involve postponing the forwarding of messages received at the first IAB node.